I bought a pair of shoes for $51. The shoes were already marked 75% off. What is the original price of the shoes.

$204.

Right.

So here's how you do it!

$51 is 25% because 100%-75% is 25% :)
So...

51-25
x-100

Cross multiply and solve for x!

To find the original price of the shoes before the discount, we can use a simple calculation.

First, we need to determine how much the shoes were discounted by multiplying the original price by the discount percentage. The formula is:
Discounted amount = Original price × Discount percentage

In this case, the discount is 75%. So, the discounted price would be:
Discounted amount = $51 × 0.75 = $38.25

Next, we need to find the original price by subtracting the discounted amount from the final price. The formula is:
Original price = Final price + Discounted amount

In this case, the final price is $51, and the discounted amount is $38.25. So, the original price of the shoes would be:
Original price = $51 + $38.25 = $89.25

Therefore, the original price of the shoes was $89.25.